Hi Pray,
Its very difficult and a smoker really needs to want it so badly to actually quit which is apparent as I waited seven years after chemo etc which shows the hold and addiction Nicotine has!
My hubby and I bought the book and DVD from Allen Carr called the easyway to quit smoking, it gives the smoker a totally different perspective on smoking completly and if she's ready to quit this will help her and is available on Amazon.
We both smoked thirty a day for as many years, quit years ago when I foolishily began again as I gained so much weight so this time I'm joining a gym and only have nine pounds to shift!
My best wishes to your sis and feel free to pass on my e mail or she can send me a pm if she'd like to chat
Denise thank you too!